141. Maximum permissible limit of magnesia content in ordinary Portland cement is
a) 4%
b) 6%
c) 8%
d) 10%
145. Which of the following has high tensile strength ?
a) plain hot rolled wires
b) cold drawn wires
c) heat treated rolled wires
d) all have same tensile strength
Ans: b
146. High carbon content in the steel causes
a) decrease in tensile strength but increase in ductility
b) increase in tensile strength but decrease in ductility
c) decrease in both tensile strength and ductility
d) increase in both tensile strength and ductility
Ans:b
147. Stress strain curve of high tensile steel
a) has a definite yield point
b) does not show definite yield point but yield point is defined by 0.1% proof stress
c) does not show definite yield point but yield point is defined by 0.2% proof stress
d) does not show definite yield point but yield point is defined by 2% proof stress,
Ans: c
148. Select the correct statement
a) Elastic modulus of high tensile steel is nearly the same as that of mild steel.
b) Elastic modulus of high tensile steel is more than that of mild steel.
c) Carbon percentage in high carbon steel is less than that in mild steel.
d) High tensile steel is cheaper than mild steel.
Ans:a
149. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than
a) 35 MPa and 42 MPa
b) 42 MPa and 35 MPa
c) 42 MPa and 53 MPa
d) 53 MPa and 42 MPa
Ans: b
150. Ultimate strength of cold drawn high steel wires
a) increases with increase in diameter of bar
b) decreases with increase in diameter of bar
c) does not depend on diameter of bar
d) none of the above
Ans: b
151. Prestressing losses in post-tensioned and pre-tensioned beams are respectively
a) 15% and 20%
b) 20% and 15%
c) 15% and 15%
d) 20% and 20%
152. In concrete, use of angular crushed aggregate in place of natural rounded gravel affects
a) direct tensile strength
b) split tensile strength
c) flexural tensile strength
d) compressive strength
153. Ratio of compressive strength to tensile strength of concrete
a) increases with age
b) decreases with age
c) remains constant
d) none of the above
154. According to Indian Standards, the grad¬ing of fine aggregates is divided into
a) two zones
b) three zones
c) four zones
d) five zones
155. Assertion A : Lightweight concrete exhi¬bits higher shrinkage than normal weight concrete.
Reason R : Modulus of elasticity of light-weight concrete is lower, than that of normal weight concrete. Select your answer according to the coding system given below :
a) Both A and R are true and R is the correct explanation of A
b) Both A.and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
156. Endurance limit of mild steel is approximately equal to,
a) 0.3
b) 0.5
c) 0.7
d) 0.8
Endurance limit is defined as the maxi-mum value of the ratio of maximum stress to short time static strength, below which no failure occurs.
157. With the increase in rate of loading during testing, compressive strength of concrete
a) increases
b) decreases
c) remains same
d) none of the above
158. For a given aggregate content, increasing the water-cement ratio in concrete
a) increases shrinkage
b) decreases shrinkage
c) does not change shrinkage
d) none of the above
159. Assertion A : The net loss of strength due to air entrainment of a richer mix is higher than that of a leaner mix. Reason R : Effect of air entrainment on improving workability is smaller in richer mix than in a leaner mix. Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
160. The bond strength between steel rein-forcement and concrete is affected by i) steel properties ii) concrete properties iii) shrinkage of concrete The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iii)
d) (i), (ii) and (iii)
161. The bond strength between steel and concrete is due to
a) friction
b) adhesion
c) both friction and adhesion
d) none of the above
162. Impact strength of concrete increases by using
i) smaller maximum size of aggregate
ii) aggregate with high modulus of elasticity
iii) aggregate with low poisson's ratio The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iii)
d) (i), (ii) and (iii)
163. Impact strength of concrete is greater for
i) water stored concrete than for dry concrete
ii) angular crushed aggregates
iii) rounded aggregates The correct answer is
a) (i) and (ii)
b) (i) and (iii)
c) only (i)
d) only (ii)
164. If the contributions of tricalcium silicate, dicalcium silicate, tricalcium aluminate
and terra calcium alumino ferrite to the 28 days strength of hydrated ordinary Portland cement are respectively W, X, Y
and Z, then
a) W>.X>Y>Z
b) X>W>Y>Z
c) W>X>Z>Y
d) W>Y>X>Z
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a) 4%
b) 6%
c) 8%
d) 10%
142. The initial and final setting times for ordinary portland cement are approxi¬
mately related as
a) T = 530 + t
b) T = 270 + t
c) T = 90+1.2t
d) T = 600-1.2t
where T and t are respectively final and initial setting times in minutes. * 166 Assertion A : The presence of tricalcium aluminate in cement is undesirable. Reason R : Tricalcium aluminate in ce¬ment contributes very little to strength of cement.
Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
143. Amount of gypsum required to be added to the clinker depends on the following contents of cement i) tricalcium silicate ii) dicalcium silicate iii) tricalcium aluminate iv) alkali The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) (i)and(iv)
144. The diameter of needle used in Vicat's apparatus for the determination of initial
setting time is prescribed as
a) 0.5 mm
b) 1 mm
c) 5 mm
d) 10mm
mately related as
a) T = 530 + t
b) T = 270 + t
c) T = 90+1.2t
d) T = 600-1.2t
where T and t are respectively final and initial setting times in minutes. * 166 Assertion A : The presence of tricalcium aluminate in cement is undesirable. Reason R : Tricalcium aluminate in ce¬ment contributes very little to strength of cement.
Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
143. Amount of gypsum required to be added to the clinker depends on the following contents of cement i) tricalcium silicate ii) dicalcium silicate iii) tricalcium aluminate iv) alkali The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (iii) and (iv)
d) (i)and(iv)
144. The diameter of needle used in Vicat's apparatus for the determination of initial
setting time is prescribed as
a) 0.5 mm
b) 1 mm
c) 5 mm
d) 10mm
145. Which of the following has high tensile strength ?
a) plain hot rolled wires
b) cold drawn wires
c) heat treated rolled wires
d) all have same tensile strength
Ans: b
146. High carbon content in the steel causes
a) decrease in tensile strength but increase in ductility
b) increase in tensile strength but decrease in ductility
c) decrease in both tensile strength and ductility
d) increase in both tensile strength and ductility
Ans:b
147. Stress strain curve of high tensile steel
a) has a definite yield point
b) does not show definite yield point but yield point is defined by 0.1% proof stress
c) does not show definite yield point but yield point is defined by 0.2% proof stress
d) does not show definite yield point but yield point is defined by 2% proof stress,
Ans: c
148. Select the correct statement
a) Elastic modulus of high tensile steel is nearly the same as that of mild steel.
b) Elastic modulus of high tensile steel is more than that of mild steel.
c) Carbon percentage in high carbon steel is less than that in mild steel.
d) High tensile steel is cheaper than mild steel.
Ans:a
149. Cube strength of controlled concrete to be used for pretensioned and post-tensioned work respectively should not be less than
a) 35 MPa and 42 MPa
b) 42 MPa and 35 MPa
c) 42 MPa and 53 MPa
d) 53 MPa and 42 MPa
Ans: b
150. Ultimate strength of cold drawn high steel wires
a) increases with increase in diameter of bar
b) decreases with increase in diameter of bar
c) does not depend on diameter of bar
d) none of the above
Ans: b
151. Prestressing losses in post-tensioned and pre-tensioned beams are respectively
a) 15% and 20%
b) 20% and 15%
c) 15% and 15%
d) 20% and 20%
152. In concrete, use of angular crushed aggregate in place of natural rounded gravel affects
a) direct tensile strength
b) split tensile strength
c) flexural tensile strength
d) compressive strength
153. Ratio of compressive strength to tensile strength of concrete
a) increases with age
b) decreases with age
c) remains constant
d) none of the above
154. According to Indian Standards, the grad¬ing of fine aggregates is divided into
a) two zones
b) three zones
c) four zones
d) five zones
155. Assertion A : Lightweight concrete exhi¬bits higher shrinkage than normal weight concrete.
Reason R : Modulus of elasticity of light-weight concrete is lower, than that of normal weight concrete. Select your answer according to the coding system given below :
a) Both A and R are true and R is the correct explanation of A
b) Both A.and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
156. Endurance limit of mild steel is approximately equal to,
a) 0.3
b) 0.5
c) 0.7
d) 0.8
Endurance limit is defined as the maxi-mum value of the ratio of maximum stress to short time static strength, below which no failure occurs.
157. With the increase in rate of loading during testing, compressive strength of concrete
a) increases
b) decreases
c) remains same
d) none of the above
158. For a given aggregate content, increasing the water-cement ratio in concrete
a) increases shrinkage
b) decreases shrinkage
c) does not change shrinkage
d) none of the above
159. Assertion A : The net loss of strength due to air entrainment of a richer mix is higher than that of a leaner mix. Reason R : Effect of air entrainment on improving workability is smaller in richer mix than in a leaner mix. Select your answer based on the coding system given below
a) Both A and R are true and R is the correct explanation of A
b) Both A and R are true but R is not the correct explanation of A
c) A is true but R is false
d) A is false but R is true
160. The bond strength between steel rein-forcement and concrete is affected by i) steel properties ii) concrete properties iii) shrinkage of concrete The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iii)
d) (i), (ii) and (iii)
161. The bond strength between steel and concrete is due to
a) friction
b) adhesion
c) both friction and adhesion
d) none of the above
162. Impact strength of concrete increases by using
i) smaller maximum size of aggregate
ii) aggregate with high modulus of elasticity
iii) aggregate with low poisson's ratio The correct answer is
a) (i) and (ii)
b) (ii) and (iii)
c) (i) and (iii)
d) (i), (ii) and (iii)
163. Impact strength of concrete is greater for
i) water stored concrete than for dry concrete
ii) angular crushed aggregates
iii) rounded aggregates The correct answer is
a) (i) and (ii)
b) (i) and (iii)
c) only (i)
d) only (ii)
164. If the contributions of tricalcium silicate, dicalcium silicate, tricalcium aluminate
and terra calcium alumino ferrite to the 28 days strength of hydrated ordinary Portland cement are respectively W, X, Y
and Z, then
a) W>.X>Y>Z
b) X>W>Y>Z
c) W>X>Z>Y
d) W>Y>X>Z
Read More Questions:
Concrete Technology and Design MCQs Part1
Concrete Technology and Design MCQs Part2
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Concrete Technology and Design MCQs Part5
Concrete Technology and Design MCQs Part6
Concrete Technology and Design MCQs Part7
Concrete Technology and Design MCQs Part8
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